radicalˈræd ɪ kəl
radical (n)
- plural
- radicals
English Definitions:
group, radical, chemical group (noun)
(chemistry) two or more atoms bound together as a single unit and forming part of a molecule
free radical, radical (noun)
an atom or group of atoms with at least one unpaired electron; in the body it is usually an oxygen molecule that has lost an electron and will stabilize itself by stealing an electron from a nearby molecule
"in the body free radicals are high-energy particles that ricochet wildly and damage cells"
radical (noun)
a person who has radical ideas or opinions
radical (noun)
(mathematics) a quantity expressed as the root of another quantity
radical (noun)
a character conveying the lexical meaning of a logogram
root, root word, base, stem, theme, radical (adj)
(linguistics) the form of a word after all affixes are removed
"thematic vowels are part of the stem"
extremist, radical, ultra (adj)
(used of opinions and actions) far beyond the norm
"extremist political views"; "radical opinions on education"; "an ultra conservative"
revolutionary, radical (adj)
markedly new or introducing radical change
"a revolutionary discovery"; "radical political views"
radical (adj)
arising from or going to the root or source
"a radical flaw in the plan"
radical (adj)
of or relating to or constituting a linguistic root
"a radical verb form"
radical, basal (adj)
especially of leaves; located at the base of a plant or stem; especially arising directly from the root or rootstock or a root-like stem
"basal placentation"; "radical leaves"
radical (Noun)
A member of the most progressive wing of the Liberal Party; someone favouring social reform (but generally stopping short of socialism).
radical (Noun)
A member of an influential, centrist political party favouring moderate social reform, a republican constitution, and secular politics.
radical (Noun)
A person with radical opinions.
radical (Noun)
A root (of a number or quantity).
radical (Noun)
In logographic writing systems as the Chinese writing system, the portion of a character (if any) that provides an indication of its meaning, as opposed to phonetic.
radical (Noun)
In Semitic languages, any one of the set of consonants (typically three) that make up a root.
radical (Noun)
A group of atoms, joined by covalent bonds, that take part in reactions as a single unit.
radical (Noun)
A free radical.
radical (Adjective)
Favouring fundamental change, or change at the root cause of a matter.
radical (Adjective)
Of or pertaining to a root .
radical (Adjective)
Of or pertaining to the intrinsic nature of something.
radical (Adjective)
Thoroughgoing.
radical (Adjective)
Of or pertaining to the root of a word.
radical (Adjective)
Involving free radicals
radical (Adjective)
Excellent.
Radical
In chemistry, a radical is an atom, molecule, or ion that has unpaired valence electrons or an open electron shell, and therefore may be seen as having one or more "dangling" covalent bonds. With some exceptions, these "dangling" bonds make free radicals highly chemically reactive towards other substances, or even towards themselves: their molecules will often spontaneously dimerize or polymerize if they come in contact with each other. Most radicals are reasonably stable only at very low concentrations in inert media or in vacuum. A notable example of free radical is the hydroxyl radical, a molecule that is one hydrogen atom short of a water molecule and thus has one bond "dangling" from the oxygen. Two other examples are the carbene molecule, which has two dangling bonds; and the superoxide anion, the oxygen molecule O2 with one extra electron, which has one dangling bond. On the other hand, the hydroxyl anion, the oxide anion and the carbenium cation are not radicals, since the bonds that may appear to be dangling are in fact resolved by the addition or removal of electrons. Free radicals may be created in a number of ways, including synthesis with very dilute or rarefied reagents, reactions at very low temperatures, or breakup of larger molecules. The latter can be affected by any process that puts enough energy into the parent molecule, such as ionizing radiation, heat, electrical discharges, electrolysis, and chemical reactions. Indeed, radicals are intermediate stages in many chemical reactions.
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"radical." Kamus.net. STANDS4 LLC, 2024. Web. 23 Apr. 2024. <https://www.kamus.net/english/radical>.
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